Socket vs File descriptor

Socket vs File descriptor

[KV Pavuram]

Hi,

Is there any  ioctl call to determine if a given descriptor is a file descriptor or a socket descriptor.

Similarly, is there a way to find out a socket descriptor type ie.e if it is SOCK_STREAM, or SOCK_DGRAM type.

Thanks
Pav


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Re: Socket vs File descriptor

[Willy Tarreau]

On Wed, Sep 23, 2009 at 11:51:19PM -0700, KV Pavuram wrote:
> Hi,
> 
> Is there any  ioctl call to determine if a given descriptor is a file descriptor or a socket descriptor.
> 
> Similarly, is there a way to find out a socket descriptor type ie.e if it is SOCK_STREAM, or SOCK_DGRAM type.

You should look at getsockopt(), getsockname(), etc... I'm pretty
sure that one of those will offer you exactly what you need. Also,
look at the error codes. Sometimes you can rely on them because you
have different types depending on whether the FD you point to is
not a socket or is a socket of invalid type.

Regards,
Willy

Re: Socket vs File descriptor

["YOSHIFUJI Hideaki (吉藤 英明)"]

KV Pavuram wrote:
> Is there any  ioctl call to determine if a given descriptor is a file descriptor or a socket descriptor.
> 
> Similarly, is there a way to find out a socket descriptor type ie.e if it is SOCK_STREAM, or SOCK_DGRAM type.

Maybe "lsof" command is your friend.

Or, depending on your purpose, you can use
getsockopt(), listen() etc. to get error
(e.g. ENOTSOCK) to test the type.

--yoshfuji